He left___after talking with his brother(anger)Listen!There is a knock_____the door.Aat B on C AandB

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He left___after talking with his brother(anger)Listen!There is a knock_____the door.Aat B on C AandB
He left___after talking with his brother(anger)
Listen!There is a knock_____the door.
Aat B on C AandB

He left___after talking with his brother(anger)Listen!There is a knock_____the door.Aat B on C AandB
He left【angrily】after talking with his brother(anger)
Listen!There is a knock【on】the door.
Aat B on C AandB
on表示在……的表面,此处knock 为名词,因为敲门的时候是敲门的表面,所以用on
动词时可以是knock at the door

A, Knock at ... 敲(门、窗)用at